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C++OOP

有这样一个问题：如何从一个无序的数组里求出第$$K$$大的数（为了简化讨论，假设数组中的数各不相同），例如，对数组$$\{ 5, 12, 7, 2, 9, 3\}$$来说，第三大的数是5，第五大的数是9。

An AVL tree is a self-balancing binary search tree. In an AVL tree, the heights of the two child subtrees of any node differ by at most one; if at any time they differ by more than one, rebalancing is done to restore this property.